Apparatus for the introduction of substances into liquids of high specific gravity



June 9, 1959 w. SCHMIDT APPARATUS FOR THE INTRODUCTION F' SUBSTANCESINTO LIQUIDS OF' HIGH SPECIFIC' GRAVITY Filed Nov. 1, 1954 f f m L ,M///

United States APPARATUS FOR THE INTRDUCTIN F SUE- STANCES INTO LIQUIDS0F HIGH SPECIFC GRAVITY Application November 1, 1954, Serial No. 465,909

Claims priority, application Germany November 2, 19d?, 4 Claims. (Cl.266-34) This invention relates to apparatus for the continuousintroduction of substances into liquids of high specific gravity. Thesubstances to be introduced may be of ultrane grain size or in powderform, or they may be granular, coarse-grained or in the form of pelletsor tablets.

An object of the invention is to provide an improved apparatus for thecontinuous introduction of and distribution of substances into liquidshaving a high specific gravity.

Another object of the invention is to provide apparatus for theintroduction of and distribution of a substance into a bath off moltenmetal.

A further object of the invention is to insure a ne distribution of thesubstance within the liquid in which the substance |is to be immersed.

According to the present invention there are provided means for theintroduction of a substance into a liquid of higher specific gravitywherein the substance is introduced as a stream flowing into the liquidagainst the hydrostatic pressure thereof, and means to promote the ilowof the said stream beyond the natural pressure head thereof.

Thus, in accordance with the invention, a constant iiow of the substanceto be introduced is maintained, this flow extending below the surface ofthe liquid, while at least the natural pressure head of the stream isutilised for 4the conveyance of the stream.

The process of the invention may be employed to preparelaluminium-silicon alloys and a salt similar to chiolite, for whichpurpose sodium silico-iluoride is introduced into chemically purealuminium. In this process, for example, the problem exists ofintroducing a substance having a specic gravity 2.7 into a bath ofmolten metal having a specific -gravity 2.4.

For a better understanding of the invention and to show how the same maybe carried into effect, reference will now be made to the accompanyingdrawing in which the sole gure is a longitudinal section of oneembodiment of the invention.

In the embodiment illustrated, a container 1 of any desired form 'isprovided,lwhich contains a bath of molten metal 2 and a salt melt 3.

Preferably, the container 1 is internally lined with carbon orelectrographite in order, on the one hand to prevent the metal `fromalloying with the container, and on the other hand to prevent impuritiesfrom entering into the mixture.

An outer tube 4 extends vertically into the container 1.y

The tube 4 is tapered at its lower end 5 and has agitating blades 6xedly attached thereto. Two or more agitating blades may be provided.

The tube 4 consists preferably of carbon or electrographite which isinsensitive to the attack of the molten metal to be treated. Extendinginto the tube 4 is an inner tube 7 which in turn contains a rod 8carrying on its lower end a feed worm 9. The feed worm 9 extends almostto the bottom end of the tube 4 and its lower end is level with that ofthe inner tube 7. The inner tube 7 is mounted on the lower end of thetube 4 without clearance, while the feed worm 9 is freely suspended inthe inner tube 7.

Provided between the inner tube 7 `and the tube 4 is a further orintermediate tube 10, which is spaced from the outer tube 4 and from theinner tube 7. The tube itl does not extend to the lower end of the innertube 7.

The outer tube 4 and the tube 10 are connected to the inner tube 7 bysecuring means 11 in the form of a perforated cap.

Cooling air penetrates through the -feed tube 12 and the annular nozzle12a iixedly connected thereto, by way A,of the holes in the cap ll, intothe clearance between the inner tube 7 and the tube 10. This coolantcirculates as indicated by the arrows and then escapes upwardly. Whilethe tube 4 terminates lin the cap 11, the inner tube 7 is extendedupwardly and is supported in ball-bearing 13. Provided at the upper endof the inner tube 7 lis a pulley i4, which is fashioned in cup form.

The lrod S is extended upwardly and held fast at the point 15a by asupport 1S. While the inner tube and consequently the outer tube can berotated by the pulley 14, the feedworm 9 and the rod 8 remain immovable;that is to say, they do not rotate.

Freely extending into the inner tube 7 is a hopper 16, which is soarranged that it remains immovable in the same way las the rod tl. Thehopper is, in fact, held by the linkage 15.

Extending into the hopper 16y from the rotatable inner tube 7 is amandrel or finger 17, which serves to enable the substance in the hopperto move uniformly downwards to the feed worm. lf, for example, astoppage of the introduced substance (for example, sodium silicoluoride)occurs at the neck 18 of the hopper, the mandrel 17 serves to removethis stoppage.

The pulley 14 is connected by a belt 19 to `la pulley 20 of a drivingmotor, which is preferably an electric motor and is mounted on a plate21 disposed parallel to the feed arrangement. The upper closure of the`container consists of a cover plate having a cooling jacket 22.

As already mentioned, the tube 4 preferably consists of graphite or thelike. Provided in the said tube for protection against oxidation by thecooling air is a jacket 23, for example of non-scaling or non-oxidizingsteel, which bears tightly against the said tube.

What is claimed is:

l. Apparatus for disbursing a substance into a uid medium having Iahigher specific gravity comprising: a container housing the medium,inner and outer tubes concentrically disposed in vertical alignment inthe container, agitating paddles on the outer tube at the lowerextremity thereof, the outer tube being connected to the inner tube, theinner tube including an upper portion extending upwardly out of theouter tube and container, a rod in the inner tube and extending upwardlyout of the same, a feed worm on the rod `in the lowermost portion of theinner tube, an `intermediate tube between the inner and outer tubes andspaced from the connection of the latter, the tubes thus deningdownwardly and upwardly directed connected passages for the flow of acoolant, rotating means engaging and supporting the inner tube above thecontainer for rotating the same and thereby the outer and intermediatetube and paddles, and a hopper extending freely and downwardly into theinner tube for feeding 3 said substance thereto, the rod extending intothe hopper, means supporting the hopper and rod and preventing the same`from rotating with the tubes.

2. Apparatus as claimed in claim 1 wherein the outer tube and paddlesare of a material chemically resistant to 5 molten aluminum.

3. Apparatus as claimed in claim 1 wherein the lowermost portion of theouter tube converges toward the inner tube for connection therewith.

4. Apparatus as claimed in claim 1 wherein the outer 10 tube extendsbelow the inner tube.

966,501 weak Aug.9,1910 15 4 Billings Sept. 23, La France Mar. 18,Sollinger Apr. 19, Smith Oct. 13, Harper Ian. 27, Sundstrom et al Oct.17, Wyandt et a1 Mar. 27, Muller June 22, Hulme Oct. 19,

FOREIGN PATENTS Great Britain Apr. 16,

OTHER REFERENCES The Iron Age, November 2, 1939, page 55.

